Figure 4.

Correlation matrix of the neutrophil granulocytes and clinical parameters. Correlation matrix (heat map) of the immunophenotypic characteristics of the neutrophil granulocytes and clinical parameters of patients with COVID-19 in the ICU (n = 12). Spearman’s ρ ranks between ± 1.0 (dark blue, dark red), high (inverse) correlation, and ± 0 (white), no correlation (abbreviations: ICU = intensive care unit; n = number; APACHE = acute physiology and chronic health evaluation; CCI = Charlson comorbidity index; CRP = C-reactive protein; PCT = procalcitonin; APTT = activated partial thromboplastin time; SSC = side-scatter).